Form for concrete slabs.



R. I.. WHITE.

FORM FOR ICOIJCRETE SLABS.

APPLICATION FILED IIILY 30.19I5.

1,222,304, Patented Apr, 17, 1917.

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ROBIN L. WHITE, 0F CHICAGO, ILLINOIS.

. FORM FOR CONCRETE SLABS.V

To all whom t may concern.'

Be it known that I, ROBIN L. lVHrrE, a citizen of the United States, and resident of Chicago, county of Cook, andState of Illinois, have invented certain new and useful Improvements in Forms for Concrete Slabs, of which the following is a speciiication, and which are illustrated in the accompanying drawings, forming a part thereof. I

The invention relates to the manufacture of those vault lights which are produced in the form of slabs comprising lights of glass mounted in a concrete body or mesh. The cost of producing these slabs is substantially reduced if the lights of glass are of considerably less thickness than the concrete body. When thin glasses are employed, however, it is necessary that the lights of glass be supported above the bed upon which the concrete is to be molded without interfering with the removal of the slab from such bed when the concrete has hardened. The object of the invention is accordingly to provide a form for concrete slabs comprising stools of improved construction for supporting lights Vof glass above the bed upon which the slab is to be molded.

In the accompanying drawings,

Figure 1 is a plan view partly broken away showing a concrete vault light slab and the form upon which it is produced7 Fig. 2 is a detail sectional view taken on the line 2-2 of Fig. 1, and showing two slightly diiferent constructions of the glass supporting stool,

Fig. 3 is a detail sectional view taken on the line 3&8 of Fig. 1, and

Fig. l is a detail plan view showing a modified arrangement which may be employed when the lights of glass are of rectangular outline. v

The vault light slab, as 10, is usually molded upon a smooth support, as for exami ple a slate bed 11. To permit the molding of concrete slabs of various sizes, the slate bed 11 will ordinarily be larger than the vault light slab 10, but is usually made Specification of Letters Patent.

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Application filed July 30, 1915. Serial No. 42,814.

sectional with a removable strip, as 12, eX- tending along one edge.

In molding' the vault light slab 10 upon the slate bed 11, the slab 10 is preferably so positioned on the slate bed, that upon the removal of the strip 12, an edge of the slab 1 0 overhangslthe remainder of the slate bed. Access to the under side'of the slab 10 along one edge permits the slab 10 to be lifted away from the slate bed 11 by an upward angular movement. The slate bed 11 is preferably also provided with 'a series of apertures or sockets 13. As shown each aperture 13 extends entirely through the slate bed11 and selected apertures serve for receiving pins, as 14, 15, by which the lights of glass, as 16, are positioned. Preparatory to molding a vault light slab, as 10, a frame work 17 of any convenient material, as wooden strips, is laid upon the slate bed 11, as a form for the margins of the vault light slab. A set of stools, as 18 or 19, are then arranged over the slate bed 11 within the frame 17 for temporarily supporting the lights of glass 16 and the usual reinforcing bars, as 20 are strung over the slate bed 11, about the stools 18 or 19. These reinforcing bars are temporarily supported above the slate bed 11 by any convenient means (not shown).

Preferably each of the stools 1S or 19 is of suiiicient height to make up the difference in thickness between that of the lights of glass 16 and the total thickness of the slab 10. To permit each stool to be iirmly'held against lateral displacement on the slate bed 11, without interfering with the lifting of the vault light slab 1 0 from the slate when the concrete has hardened, each stool, as 18 or 19 is desirably made in two readily separable parts. As shown, each stool com prises an inverted cup 21 and a base 22 or 23.

The inverted cup 21 provides the main support for the corresponding light of glass 16. Then the lights of glass are round, the cup 21 is made in the form of a truncated cone with a fiat top 211 and an open bottom 25. The Vbase 22 or 23 is formed to lit within the open end of the corresponding cup 21. To this end each base 22 or 23 1s composed of a flat plate 26 or 27 having upturned edges 28 or-29. The base 22 .of the stool 18, is constructed with the pms 15 formed integral, as by being struck downwardly from the plate 26. The base 23 of the stool 19 on the other hand, has apertures 30 formed in the plate 27 and the pins 14 are removably entered in the sockets 13 through said apertures.

Each light of glass 16 is preferably formed with studs, as 31, upon its bottom face. The top 24 of each cup 21 is accordingly apertured, as at 33, for receiving the studs 31 of the glass. As the cups 2l of the several stools 18, 19 are lifted from the slate bed 11 with the slab 10, provision is desirably made to permit of the engagement of these cups with a tool (not shown) for withdrawing the cups from the under side of the concrete slab. rlhis is readily accomplished if the lights of glass 16 are each formed with an intermediate concave portion 32 upon the underside. When the lights of glass are formed in this way the top plate 24 is provided with a central opening 34 between the apertures 33. The concave portion 32 of the glass 16 then serves to permit of the said tool being entered through the opening 34 and engaged with the top plate. of the cup about the opening for exerting an outward pull upon the cup. The separation of the cups 21 from the base 22 or 23'when the concrete slab 10 is lifted by angular movement, avoids the binding which would occur if it were necessary to withdraw the pins 14 or 15 from the slate bed 11 during the lifting movement of the slab. That is to say, the formation of the stools, as 18, 19, from two readily separable parts with the base, as 22 or 23, iitting into the flaring open end of the cup 2l, avoids the necessity of lifting the concrete slab 10 away from the slate 1bed 11 by a movement in a straight line which is perpendicular to the plane of the bed.

When lights of glass of rectangular shape, (not shown) are to be used in the vault light slab, a supporting stool 35 of the form illustrated in Fig. 4, is preferably employed. The stool 35 may be of the same construction as the stool 19 except in shape. Its base portion 36 is made from a Hat plate having turned edges 37 and with apertures to receive the positioning pins, as 14. It fits within the flaring open end of a cup 38 which in this instance takes the form of a truncated pyramid having a flat top 39.

lVhile I have shown and described the use of round stools, as 18, 19, for supporting round lights of glass and square stools, as 35, for supporting square lights of glass, it will be understood that the square stool, as

35, may be employed for supporting the round lights of glass, as 16. Stools of but one form, as 35, will accordingly serve for supporting lights of glass which are either round or square.

I claim as my invention,-

1. A glass supporting stool for concrete forms comprising, in combination, an inverted cup flaring downwardly and open at the bottom, the top of the cup being constructed to provide a seat for removably receiving the light of glass, a centering plate removably fitting within the open bottom of the cup and studs for positioning the centering plate upon an apertured bed plate.

2. A concrete form supporting stool for embedded glasses having recessed bottoms comprising an inverted cup flaring downwardly and open at the bottom with a flat top wall lconstituting a seat for removably i receiving the light of glass and with an opening in the said top wall in line with the recess in the bottom of the light of glas, for the insertion of an extracting too 3. A form for concrete slabs comprising, in combination, a sectional bed plate comprising a main body portion and a remov-V able strip extending along one edge of the body, a frame forming a marginal mold for the slab resting on the said bed plate to cover parts of both of its said sections, a plurality of glass supporting. stools each comprising an inverted cup flaring downwardly and open at the bottom, a centering plate tting within the open end of the cup and means for locating the centering plates of the several stools upon the said body portion of the bed plate.

4. A form for concrete slabs with embedded glasses of less thickness than the slab, comprising, in combination, a bedv plate, the upper surface of which constitutes a mold for the bottom of the slab, a plurality of two part glass supporting stools, the parts of each stool being separable by angular lifting movement and one of the parts of each stool being constructed to provide a seat for engagement with the underside of a light of glass above the level of the said'upper surface of the bed plate and a mold for the margins of a flaring opening in the slab extending downwardly from the underside of the light of glass to the bottom of the slab and means for locating the other part of each stool upon the bed plate.

A form for concrete slabs with embedded glasses of less thickness than the slab7 comprising, in combination, a sectional bed plate comprising a main body portion and a removable strip extending along one edge of the body, a frame forming a marginal mold for the slab resting on the said bed plate to cover parts of both of 1w glass supment with the under side of a light of glass at a distance from the bed plate and a mold for the margins of a flaring opening in the Copies of this patent may be obtained for ve cents each, by addressing the slab extending downwardly from the underside of the light of glass to tbe bottom of the slab and means for locating the Several stools upon the said body portion of the bed plate.

ROBIN L. WHITE.

Commissioner of Patents,

Washington, JD. 0.9 

